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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4545dc91630c8b63620d9aba94ee3b1d3a7018be6df3ee986e619cafbb47ef16' 
  AND token = 'lYwOB1EBkTCIamop6sQYrlpeEnPebjV0SmW1dzYCJmU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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