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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0af9551dec2448f742b9e1f72887631c1e1638050e6c1f6fd45534fe13bec0a0' 
  AND token = '6FXH1id7HGUoleMIyRRqIT1X3JaajYU8+Mw13v4+j1c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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