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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b1a8a25ffbef58f1a9abc859035c19895cfda372f06c002e8f9b843ee3eacc06' 
  AND token = 'ngYDS2+y6XeVBvyCCH918iArShLuz2NdpYjMX4WEY5g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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