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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '33609a1f9c1d58f6d7b375e1ea260bb41766ad6acf126f3bd8d5bd80c3cd8a29' 
  AND token = 'dDyMTk+Qw0sQpxCOZKunlARJmuernPICo42cnP/5t7Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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