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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '01cf901010bb80b98a44e5611dd29089233fce90ad8e9d3d3bf997a32508b3a1' 
  AND token = 'k7TtGlikONr/rYtShWsKYU4y030BLAAvDo43pSkjrc0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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