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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '460c547e45cc0401c8f3c8927786286ae20fb816c016a8de91656a0ecbe54bb1' 
  AND token = 'h0DPIBQigAUGFza4zmSy/dURoma1WL+5yTGRdC9J0Iw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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