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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4aed326e7ea1291e00cbcb7d04ff42d097a7ab8fdb526bd8f3c00b85895eca3d' 
  AND token = 'xUWt/TOXAkyM1zzQgpNwNmc9aL0hn/JnszDqYsL30EI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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