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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b211f8a4c40ea27a3abad26aa30c725b6039924c07263ea11812ca664dee1b0c' 
  AND token = 'NJu15Q+CMyf5Gs8XZtBOOPqb+mrLLp3rHHrGneYV998=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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