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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'aee7676046b5d533f5b3e672a1336e33a67cb8a3d1561d97f92a1e5773e48fa2' 
  AND token = 'rIF00rb9jT36BGtRJqqeJlFhoC+hkgpJWPWpM3px/r4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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