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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c3c4179ef10f76f39826a279f2c7fe535feb3f2c1774a9a3c572a2a4d58e0af1' 
  AND token = 'qw3+8TMi7988Mdyy416APjAayU9FQoN1dv2AECyw7eg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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