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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '37c4b69a68cffdea4f409e4cb75720b49783a1194106ade92d292ef6fa814d7b' 
  AND token = 'ibcduzhvt2yJR/BprR75tre5+7ejoG6ex/GQf3oLrtc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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