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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9605a0654a50f238620218ebada0e92eac3eeeb9602012aba576f9dd93e7eee4' 
  AND token = 'qkJWXmb0i89/R7eNqCDWfzPOd1ysw2XEG4IBflS6yrI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}