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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0291d6c2bf4186d6d56ae390757eca6fce9320454c570bdd8cfaf0e1b0bc7274' 
  AND token = 'DlvibJ4upkvf675mMGVp6FNBlNdTO5aho88yDv7anFY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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