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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a55ebf97c65f371cd34005a1dcb4dc150cfffa0cae705cd40cd47a56ab3ecd13' 
  AND token = 'km4y9Wa3ZAdxbndKjT+a2LDKwr8ErUHAF91uwXoeXHE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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