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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '01f6c357aeeecc0ab0b949139f2e4b8210b95cf8622033c53925090e9e0fdfdb' 
  AND token = 'n+O0/1FA46InzMODj4y/j+Wi7Q3EMEIO80WbJVTSg3I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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