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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '44147d70e8d55cee46920ef1a4f0b0f29d4360df19853ae6ef3b1085ba1c269e' 
  AND token = '0X45z4OrREdIekjPKHDAzXEdSoaqr6b/2vC4MIAyv74=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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