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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '44d188563b4ccb042bc46d1ccf975fba4a2d04d21eafaef0ae2767734899598b' 
  AND token = 'r42wvXI4D6cmo8IRMRdaw9B+oiLfChlGqOkX5lV1bkk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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