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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ca3a76a930486da936133cbee262620d79c011e629bf5ec50c544bdf2b3dab22' 
  AND token = 'QVdFDe212N9N4jz47Cmqxo6fpzqmRsr79KTSFSVtdKg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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