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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7cd8d7cd01f98ea054c9f0130e0fd1f0cd592875795bd7d83364b742e18aaa26' 
  AND token = 'rZXxoFeYfFHI2H6FEzFLoYwIeliYJUda0FKZHp/OHJM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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