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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ea5548734540fddd986a9f19a3aeb26c86c85d6d892d97917e2166ef39e130cb' 
  AND token = 'Ph0AMZkChuVa5NRVylvZImt6dfj389/aor7ZhWK82QQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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