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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4ab36f4bc8930caa8be3943594f54ec94afb7b71c9ac749acd2c1249e8dd9bde' 
  AND token = 'AdT/Mw/XtMnQ5RHc7xbGrqwDIwPLKc4DQh1hbSeIdfw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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