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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a4d2e465d2bdafcbb827fb8d67095f37ad6fe94b4c91125ba8d2a79eb512d6e6' 
  AND token = 'Bu8uJ2zyWVAU5pdlw5ybrWDYxGb8kGOr3Kk8iY5oXAo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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