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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7aeba50b7aca29d1e945f9406e851d8fdb5ce78bcebdbcee9f4c1a0cf092a35d' 
  AND token = 'JSUQVcW8DD1+3fYYZOYaOYTgi5pA3Z1jEkgDm9YqWc4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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