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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c4bdca7e68c6a13e0f1830c9e967ee8c79b4c125a2b4ab2a6412303864c43386' 
  AND token = 'SuNogtR/zF260Mqsmfltc81yDtz2tJoAU6pZFqjqjJE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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