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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a3aaca3ff5405e91e6928b80012e39ec29a87534fb2ab002daa11fc33b62b69e' 
  AND token = '050vZqWUt310pkSfA30dADQt3SHw3vFNX9Xq3emkoM4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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