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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c467d7c8bf805cd405b547f927e1138943c12016bf0b8e7d6d77d8ffb4dfc334' 
  AND token = 'aKsa7+q8z1euvWRpAlmu8sLLF1Cvs0az7WOPWZX4jCQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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