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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '95ba812cff88a6be82a34a69b0605d9a8daadc0187a5fb2239fd1f5b8eacc2b2' 
  AND token = '0TaJeAhSEjWnyM3YIEEmLP+v3E2o3kUf4GLf70bw7gA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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