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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2999b97f10e27312bb6f347f28d039c00a8a64e3a8602d0348ad6e632a1bb0b6' 
  AND token = 'P1G7ORmP2DSyEbY/Mj+Q85EXwv0xF2BMv3O7IWsY76w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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