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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3ac6c66a5f2f84ce6cd2241a630199c12071c862b520572a54aeb8c3642807e6' 
  AND token = 'rAI+3C70YAgaaNX5dUO9+3udzC3s9Rhlp47gHsLARAY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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