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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1b6c317c224b260e96924450b8a89a730aa9d31eb3bb508877f0d2d842b22a86' 
  AND token = '2wPj3yyQxQFO9treR/RvguBPAaT7xrNSwZ04vV3IcFY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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