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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd3fcbdaf4676708b1de3027d1fa99b8ae023dec6602144e2924835200bd24d94' 
  AND token = 'VuwUYie6GO491NI8t5db4Y+quMnIBFkVBsHEY2qmXlI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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