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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '90d0e75fde04dec75355eed2f56ead50c4cb8b980e6fbc85f8d99237fa073563' 
  AND token = 'Y8uRS7eqRx48Lue2Au6k7AbrFPLNEh0/TJhh/Olpk5s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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