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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c5d11b61cbeefa9766a111965ef87b06c86abf503d76427f2088e0b59a13e726' 
  AND token = 'O6Ea3KhUMKXAtCbjvIQar9Y+rwNAe71j/0Kka6pht/k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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