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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1454a3d126c191622ffde80b6e92e5f6eae1afe7e66fed8e0571923bc4d65151' 
  AND token = 'YuJSBFrbHfL7IvjsPGO7Ux5gy3xfg+mfCti4f4BQbn8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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