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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '54e7bd4919609972c0d129c7d66b11e463f4c1ca107fef03557bde587e4c4da0' 
  AND token = 'y3avMwaCm698h1xl7IpyBcTSXWKaifSPOQvJg4X+Cps=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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