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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '069484302b8badcd8558ae7bc198e049bf26ce2fc761364a3a4fae06c09598e3' 
  AND token = '1o5wZ2Letz/lJuy/af1fOwo0dCcMSPgl2onO3YbiMlE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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