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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e3101164fe22d0cba8f07dd59edd278309723e97937b4fec304b82a64b4e9191' 
  AND token = 'SejS5NMkKdUtuQVjgnwsp6wko6xZkbLgULvNf/Wa8W0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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