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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a4f95f6fd34a868c92e3a3c256c264ee0800f3ae1d2be74ce953ccca80fae2af' 
  AND token = 'M7S0Fz/0KV30cBo8N3+QLseauoXzXZOBOtN2Ft6e9gg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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