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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9521556b4de82426975de642b00dbeed33473d6f9059d452396b591dba6b8103' 
  AND token = 'g/q6I3TcSfOI0YUTaoR9A/Ds0byqGFqkPZ04m2X1q4c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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