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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '83f5168bd655d116ca138d085b593374f25a2e0316cf835a371ab1f72108cb34' 
  AND token = '0TQ6aEFNe0FnB4Mi3pZJD4CO8wFmyjVq8V2n1fM/B0k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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