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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '226590b8fb3e68199d4c8d275ac39461ec0d0b5c61f1032576c3ee13da93e270' 
  AND token = 'c+ro+tOzTv1bzrGKR+55pi6ggCCjkUX19INQAIBr9rE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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