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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1d41b1ac7e9c90c449dc0f60a56a97db5d6e88599dd400dccbe6cf0acd43c23a' 
  AND token = '7U8z02CAB5RMvJWHmO5Q/sc8IL5HVpHOt6o2YgNTn1U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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