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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e7807c26b0331458be2de17c349434075668219dcdcca69c3671da761700cc01' 
  AND token = 'O74XId58P3Dax5pYCmrYx5xh5IXkqkx06IrfRWzFAcw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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