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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ce22c5972e13697e5fae6b482b0df3aed4739e12a0ac780cfb618cba1b2629b0' 
  AND token = 'iOjDTyrAWKK6JDJ5CmrsC7RGHJdeizGgvbyTMiu1Wm4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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