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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bc488a81dc934073aa4686c7f5768af45c056cfae955ffb7fdfa31e2a6dae2fe' 
  AND token = 'RYtfrxX2Iur+b0FhrZCwq23j1kOQ8jQC+oba3KSDPnw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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