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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e46e360748ae58b391a67499faf1afb4aa8713f1cd0bd8b061d5848f17810c3e' 
  AND token = 'XHDlBG/a9pj9ULkxFHgiNXTquAzAe4MJC5a2apitxHk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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