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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6c158f0e144d0f19dc7f64bdb5f4c0eb15c3dd2c739d01b326adfd925d1ef947' 
  AND token = '4gjjiZcM4h5qhbJvbQblvS/0EcioCDX4yNLi+uaaZFw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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