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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0b5787ffd01691361e7b8ff010cd95177fd6c7ef8e7a65325324d1c1493ee311' 
  AND token = 'qx1/B2Rk3OkXzf+1YFkiPI09PzOul4a+BRhLGP+3pZk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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