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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c26435c03c00f714475e55ad300a91df6eff0a9925616b6e7e7e186d98682220' 
  AND token = 'CFFaLMJAnM2SP6wwn89NHvEsW0A0V1PQKWM6UddHTdE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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