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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5fc840a3c95c5636fb2a6e79687fe8d0d2cb3095543c777af2bcb083611bedcf' 
  AND token = '+GRQLrLOiNak1UO0yaxuKy+poL1fgFnM4ZpXYepjMqk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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