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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a294f50e01f2f7d05cfdd187e4982d0e65d5c4fff0b029e4fdb875ab288ba1cf' 
  AND token = 'pGO3KKgPaUNy3iTpYeP2s0idMiXrsq8pSyMCoQJ+XkA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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